The Model For The Choice Of Transportation Mode Of The Logs In Erenhot

With the development of our country, the demand of timber has increased, the gap between supply and demand is increased ceaselessly. In order to meet people's material needs, our country has increased imports of timber. In recent years, most of the imported logs come from Russia, and Erenhot port has become the fourth road port trade between China and Russia. A large number of small and medium timber wholesalers gather in the port, purchase logs, and then ship back to their own wood plant. For the difference of trains' loading capacity, in the process of transferring vehicles, it is likely to cause surplus. The wholesalers can store the surplus timber in the timberyard of port, sale in port at low price, or ship back. While, road transportation is usually chartered and there is no direct surplus logs. But if the surplus in last purchasing was stored in port, there will be surplus still.So far, the study on the transportation of timber is few, especially the surplus due to the limitation of vehicles' loading capacity. In this paper, we study on the mode of transportation and the handling of the surplus in the procurement of logs for timber wholesalers. It not only has academic value, but also can provide some reference for timber wholesalers.This paper firstly analyzes the characteristics of logs in transportation, the process of purchasing timber and the factors influenced wholesalers'decision, include the amount of purchase, the mode of transportation, the handling of surplus, delay and stock.Secondly, in order to choose the best mode of transportation, we establish a model of dynamic programming. In the model, we want to satisfy customers' needs first, then try to make the total purchasing costs minimized. Next, a timber wholesaler is taken as an example to verify the correctness of the model. The results show he should see the issue with a long-term sight and combine the purchasing decisions of the prior time and the next time with the impacts of each factor rather than decide by experience.Finally, further suggestions for handling of the surplus are put forward. Good shelter and security measures are needed while storing in the port; sale to the most suitable wood plant in port or other timber wholesalers; according to the business scale, to build a cooperative alliance and transport back together, then expand the scale, to purchase the right wagons and avoid the surplus actively.